CN102619973B

CN102619973B - Clutch capacity detection systems and methods

Info

Publication number: CN102619973B
Application number: CN201210020262.5A
Authority: CN
Inventors: M.D.惠顿; T.R.斯托克戴尔; A.P.伊格尔; N.E.威尔克
Original assignee: GM Global Technology Operations LLC
Current assignee: GM Global Technology Operations LLC
Priority date: 2011-01-25
Filing date: 2012-01-29
Publication date: 2015-02-18
Anticipated expiration: 2032-01-29
Also published as: US20120191310A1; US9746073B2; DE102012001090B4; DE102012001090A1; CN102619973A

Abstract

A system for a vehicle includes a desired pressure module, a valve actuation module, a filter module, and a capacity detection module. The desired pressure module selectively generates an increase in a desired pressure of hydraulic fluid for a clutch of an automatic transmission. The valve actuation module actuates a solenoid valve based on the desired pressure. The solenoid valve supplies hydraulic fluid to a regulator valve, and the regulator valve supplies hydraulic fluid to the clutch. The filter module filters an acceleration of a shaft of the automatic transmission to generate a filtered acceleration. The capacity detection module indicates whether the clutch reached torque carrying capacity based on the filtered acceleration.

Description

Clutch capacity detection system and method

Technical field

Present disclosure relates to transmission for vehicles and relates more specifically to clutch control and method.

Background technique

This provide background technique to describe substantially to present the background of present disclosure.The work of the current using names inventor in scope described by this background technique part and must not otherwise as each side of the description of prior art when submitting to, both indefinite prior aries not also impliedly being considered to conflict present disclosure.

Motor produces the moment of torsion being output to speed changer.The automatic transmission of vehicle can comprise the rubbing device of multiple fluid control, such as clutch.Control module can according to predetermined pattern engage or cut-off clutch in one or more thus set up different gear ratios (being also referred to as velocity ratio) in the transmission.

Gear ratio can define according to the ratio of transmission input speed divided by transmission output shaft speed.Can comprise from a gear ratio to another gear ratio gear shift and being separated with current gear than the first clutch be associated, and engage the second clutch be associated with next gear ratio.Clutch to be separated during gear shift is called as clutch of leaving away (offgoing clutch), and clutch to be joined during gear shift is called as and namely faces clutch (oncoming clutch).Such gear shift can be called as clutch-clutch shift (clutch-to-clutch shift), because operating speed does not respond or flywheel element.

Summary of the invention

System for vehicle comprises desired pressure module, valve actuation module, filter module and capacity detecting module.Desired pressure module is the increase that the clutch of automatic transmission optionally produces the desired pressure of hydraulic fluid.Valve actuation module activates solenoid valve based on desired pressure.Solenoid valve provides hydraulic fluid to modulating valve, and modulating valve provides hydraulic fluid to clutch.Filter module to the acceleration filtering of the axle of automatic transmission to produce filtered acceleration.Capacity detecting module indicates clutch based on filtered acceleration and whether reaches moment of torsion bearer cap (torque carrying capacity).

Method comprises: the clutch for automatic transmission optionally produces the increase of the desired pressure of hydraulic fluid; Solenoid valve is activated based on described desired pressure; Filtered acceleration produces to the acceleration filtering of the axle of described automatic transmission; And indicate described clutch based on described filtered acceleration and whether reach moment of torsion bearer cap.Solenoid valve is to modulating valve supplying hydraulic fluid, and modulating valve is to clutch supplying hydraulic fluid.

Present invention also offers following technological scheme.

The system of scheme 1. 1 kinds of vehicles, comprising:

Desired pressure module, it is the increase that the clutch of automatic transmission optionally produces the desired pressure of hydraulic fluid;

Valve actuation module, it activates solenoid valve based on described desired pressure,

Wherein said solenoid valve is to modulating valve supplying hydraulic fluid, and described modulating valve is to described clutch supplying hydraulic fluid;

Filter module, its to the acceleration filtering of the axle of described automatic transmission thus produce filtered acceleration; And

Capacity detecting module, it indicates described clutch based on described filtered acceleration and whether reaches moment of torsion bearer cap.

The system of scheme 2. according to scheme 1, wherein when car speed be greater than zero, described clutch there is no bearing torque and a second clutch bearing torque time, described desired pressure module produces described increase.

The system of scheme 3. according to scheme 1, also comprises:

Minimum value detecting module, its detection is in the minimum value of the described filtered acceleration of one of the first predetermined amount of time and the second predetermined amount of time period generation; And

Maximum value detecting module, the maximum value of the described filtered acceleration that its detection produces during one of described second predetermined amount of time and the 3rd predetermined amount of time,

Wherein said second predetermined amount of time is after described first predetermined amount of time, and described 3rd predetermined amount of time is after described second predetermined amount of time,

Wherein terminate described increase in one of described first and second predetermined amount of time period described desired pressure module and reduce described desired pressure, and

Wherein said capacity detecting module indicates described clutch based on described minimum value and maximum value further and whether reaches moment of torsion bearer cap.

The system of scheme 4. according to scheme 3, wherein said capacity detecting module indicates described clutch based on very first time when there is described minimum value with the second time when there is described maximum value further and whether reaches moment of torsion bearer cap.

The system of scheme 5. according to scheme 4, also comprises noise detection module, and whether its noise indicated in described acceleration based on the difference between described acceleration and previous accekeration is greater than predetermined noise,

Whether wherein said capacity detecting module is greater than described predetermined noise based on noise further indicates described clutch and whether reaches moment of torsion bearer cap.

The system of scheme 6. according to scheme 5, wherein when described noise be less than described predetermined noise, between described maximum value and minimum value the second difference is greater than the first predetermined acceleration, described second time, the time period after the described very first time and between described first and second times was less than predetermined amount of time time, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

The system of scheme 7. according to scheme 6, wherein when described second difference is greater than second predetermined acceleration larger than described first predetermined acceleration, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

The system of scheme 8. according to scheme 3, also comprises noise detection module, and whether its noise indicated in described acceleration based on the difference between described acceleration and previous accekeration is greater than predetermined noise,

Wherein when described noise is greater than described predetermined noise and the second difference between described maximum value and minimum value is greater than predetermined acceleration, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

The system of scheme 9. according to scheme 1, also comprises parameter and knows module, and its response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine the volume causing described clutch to reach the described hydraulic fluid of moment of torsion bearer cap.

The system of scheme 10. according to scheme 1, also comprises parameter and knows module, and its response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine that described hydraulic fluid overcomes the pressure of the Returnning spring of described clutch.

Scheme 11. 1 kinds of methods, comprising:

Clutch for automatic transmission optionally produces the increase of the desired pressure of hydraulic fluid;

Solenoid valve is activated based on described desired pressure,

Filtered acceleration produces to the acceleration filtering of the axle of described automatic transmission; And

Indicate described clutch based on described filtered acceleration and whether reach moment of torsion bearer cap.

The method of scheme 12. according to scheme 11, also comprises: when car speed be greater than zero, described clutch there is no bearing torque and a second clutch bearing torque time, produce described increase.

The method of scheme 13. according to scheme 11, also comprises:

Detect the minimum value of the described filtered acceleration produced in one of the first predetermined amount of time and the second predetermined amount of time period; And

Detect the maximum value of the described filtered acceleration produced in one of described second predetermined amount of time and the 3rd predetermined amount of time period,

Wherein said second predetermined amount of time is after described first predetermined amount of time, and described 3rd predetermined amount of time is after described second predetermined amount of time;

Terminate described increase in one of described first and second predetermined amount of time period and reduce described desired pressure; And

Indicate described clutch based on described minimum value and maximum value further and whether reach moment of torsion bearer cap.

The method of scheme 14. according to scheme 13, also comprises: indicate described clutch based on very first time when there is described minimum value with the second time when there is described maximum value further and whether reach moment of torsion bearer cap.

The method of scheme 15. according to scheme 14, also comprises:

Whether the noise indicated in described acceleration based on the difference between described acceleration and previous accekeration is greater than predetermined noise; And

Whether be greater than described predetermined noise based on noise further to indicate described clutch and whether reach moment of torsion bearer cap.

The method of scheme 16. according to scheme 15, also comprise when described noise be less than described predetermined noise, between described maximum value and minimum value the second difference is greater than the first predetermined acceleration, described second time, the time period after the described very first time and between described first and second times was less than predetermined amount of time time, indicate described clutch and reach moment of torsion bearer cap.

The method of scheme 17. according to scheme 16, also comprises: when described second difference is greater than second predetermined acceleration larger than described first predetermined acceleration, indicates described clutch and reach moment of torsion bearer cap.

The method of scheme 18. according to scheme 13, also comprises:

When described noise is greater than described predetermined noise and the second difference between described maximum value and minimum value is greater than predetermined acceleration, indicates described clutch and reach moment of torsion bearer cap.

The method of scheme 19. according to scheme 11, also comprises: response indicates described clutch and reaches moment of torsion bearer cap to determine the volume causing described clutch to reach the described hydraulic fluid of moment of torsion bearer cap.

The method of scheme 20. according to scheme 11, also comprises: response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine that described hydraulic fluid overcomes the pressure of the Returnning spring of described clutch.

The further application of present disclosure is will be apparent to from detailed description provided below.Should be appreciated that, to describe in detail and particular example is intended to be only descriptive and be not intended to limit the scope of the disclosure.

Accompanying drawing explanation

More intactly present disclosure will be understood, in accompanying drawing from the detailed description and the accompanying drawings:

Fig. 1 is the functional block diagram of the example vehicle system according to present disclosure;

Fig. 2 is the functional block diagram of the exemplary variator's system according to present disclosure;

Fig. 3 is the functional block diagram of the exemplary clutch capacity detection system according to present disclosure;

Fig. 4 knows the exemplary plot of event as the desired pressure of the function of time according to present disclosure for clutch fill volume;

Fig. 5 knows the exemplary plot of event as the desired pressure of the function of time according to present disclosure for return spring pressure;

Fig. 6 is the exemplary plot of the desired pressure as the function of time according to present disclosure, remaining time and acceleration; And

Fig. 7 A-7B illustrates the flow chart determining when the illustrative methods of clutch arrival capacity according to present disclosure.

Embodiment

Following explanation is in fact only schematic and attempts restriction disclosure, its application never in any form or use.For the sake of simplicity, identical reference character will be used for referring to like in accompanying drawing.As used herein, term " at least one in A, B and C " should be considered to mean the logic (A or B or C) using nonexcludability logic OR.Should be appreciated that, the step in manner of execution can be carried out when not changing the principle of present disclosure with different order.

As used herein, what term " module " can refer to is following part or comprises the following: specific integrated circuit (ASIC); Electronic circuit; Combinational logic circuit; Field programmable gate array (FPGA); (shared, special or in groups) processor of run time version; Other suitable elements of required function are provided; Such as, or some or all combination above-mentioned, is placed in SOC(system on a chip).Term " module " can comprise (shared, the special or in groups) storage storing the code performed by processor.

The term " code " used above can comprise software, firmware and/or microcode, and can refer to program, routine, function, classification and/or object.The term used above " is shared " and is meaned that some or all codes from multiple module can use single (sharing) processor to perform.In addition, some or all codes from multiple module can be stored by single (sharing) storage.The term " in groups " used above means that some or all codes from individual module can use one group of processor to perform.In addition, some or all codes from individual module can use storage stack to store.

Equipment described herein and method can be realized by one or more computer program performed by one or more processor.Computer program comprises the processor executable be stored on non-transitory tangible computer computer-readable recording medium.Computer program can also comprise the data be stored.The non-limiting example of non-transitory tangible computer computer-readable recording medium is nonvolatile memory, magnetic store and optical memory.

Control module optionally judges and whether the clutch indicating automatic transmission is in or has reached moment of torsion bearer cap.Clutch transmitting torque between input shaft and output shaft when clutch is in moment of torsion bearer cap.Control module can such as when the acceleration of input shaft or output shaft change within a predetermined period of time at least prearranging quatity time optionally judge that this clutch is in moment of torsion bearer cap.But, being delivered to the noise inputing or outputing axle and/or vibrating to cause acceleration to change at least described prearranging quatity within a predetermined period of time.

During stable state driving situation, control module optionally attempts the clutch that slight joint is not used for keeping gear ratio.If clutch arrives moment of torsion bearer cap, then will there is slight stagnation and measurable retardation will occur.Control module gets rid of/restraint speckle to acceleration (signal) filtering.The minimum value of the filtered acceleration that control module detection produces during attempting engaging clutch and in response to the attempting to engage of clutch and maximum value.Control module record produces time during minimum and maximum value.What whether control module occurred in minimum value based on the difference/difference between minimum and maximum value, time period between the described time and maximum value judges whether clutch arrives moment of torsion bearer cap afterwards.

With reference now to Fig. 1, present the functional block diagram of example vehicle system 10.Explosive motor 12 is via torque converter 16 drive speed transmission 14.Motor 12 can comprise the motor of such as flare h type engine h, compression and combustion h type engine h and/or other suitable types.Vehicle can also comprise one or more electric motor and/or motor generator unit (MGU) 18.

Motor 12 is via engine output shaft 20(such as bent axle) to torque converter 16 output torque.Torque converter 16 supplies moment of torsion via transmission input shaft 22 to speed changer 14.Although speed changer 14 will be discussed as clutch-clutch-type speed changer, the automatic transmission of dual-clutch transmission (DCT) or other suitable types (comprising automatic-manual speed changer) can be utilized.

Speed changer 14 can comprise one or more gear train (not shown), and moment of torsion can be passed between transmission input shaft 22 and transmission output shaft 24 by described gear train.Transmission output shaft 24 drives the transmission system 26 of Vehicular system 10, and transmission system 26 transfers torque to the wheel (not shown) of vehicle.Speed changer 14 can comprise one or more extra input shaft and one or more extra output shaft of being associated with each clutch and gear train.

Gear selector 28 makes user can the operator scheme of selective transmission 14, includes but not limited to park mode, reverse gear mode, neutral mode or one or more drive pattern that moves ahead.Speed changer 14 can realize multiple gear ratio.Only exemplarily, speed changer 14 can realize six or more move ahead gear ratio, a reverse gear ratio and geared neutral ratio.In various embodiments, speed changer 14 can realize the reverse gear ratio of move ahead gear ratio and/or the greater number of more or less quantity.Gear ratio may be defined as the ratio between the rotational speed of transmission input shaft 22 and the rotational speed of transmission output shaft 24.

Engine control module (ECM) 60 controls the operation of motor 12.In various embodiments, ECM 60 or other control module (not shown) can control the operation of one or more MGU 18.The operation of transmission control module (TCM) 70 controlled variator 14.Although TCM 70 is shown as being embodied in speed changer 14, but in various embodiments, TCM 70 may be implemented within the outside of speed changer 14.ECM 60 can share data via connection 72 with TCM 70 and/or communicate.

With reference now to Fig. 2, present the diagram of the illustrative embodiments of transmission system 100.In the figure 2 example, the shown in broken lines and fluid of electrical communication is communicated with and illustrates with solid line.Speed changer 14 comprises multiple clutch, such as clutch 104.Although illustrate only clutch 104, but speed changer 14 can comprise more than one clutch.In preset time, the gear train that will be engaged in clutch selective transmission 14.In other words, Clutch Control gear ratio.When the various combination of one or more in engaging clutch, different gear ratios can be set up.About clutch 104, present disclosure will be discussed, but present disclosure can also be applied to other clutches of speed changer 14 equally.

Transmission oil or other suitable hydraulic fluids be directed into leave clutch 104 in case the joint of solenoidoperated cluthes 104 be separated.Pump 112 draws transmission oil from other appropriate sources of sump 116 or transmission oil.Pump 112 pressurizes to transmission oil and transmission oil is provided to line pressure regulator 124.

Line pressure regulator 124 provides transmission oil to solenoid valve 128 and modulating valve 132.Only exemplarily, solenoid valve 128 can be variable discharge solenoid valve (VBS).The pressure of the transmission oil exported by line pressure regulator 124 can be called as line pressure 134.TCM 70 can control line pressure regulator 124 such as to realize the expected value of line pressure 134.The pressure that solenoid valve 128 outputs to the transmission oil of modulating valve 132 can be called as order pressure 140.TCM 70 can Controlling solenoid valve 128 in case realize order pressure 140 expected value and/or by transmission oil from solenoid valve 128 discharge get back to sump 116.

Modulating valve 132 controlled variator oil is to the flowing of clutch 104.Modulating valve 132 is to aperture 136 output speed changer oil.Modulating valve 132 can also provide the transmission oil getting back to sump 116.The speed of aperture 136 limiting transmission oil flowing between modulating valve 132 and clutch 104.The pressure of the transmission oil between modulating valve 132 and aperture 136 can be called as feedback pressure 144.The pressure of the transmission oil between aperture 136 and clutch 104 can be called as clutch pressure 148.

Except other things, clutch 104 also comprises piston 160, Returnning spring 164 and clutch pack 168.Returnning spring 164 orders about piston 160 and deviates from clutch pack 168.When clutch pressure 148 be greater than Returnning spring 164 be applied to the pressure of piston 160 time, transmission oil makes piston move towards clutch pack 168.As long as clutch pressure 148 is enough to overcome Returnning spring 164, then continuation is moved until piston 160 and clutch pack 168 produce physical contact towards clutch pack 168 by piston 160.

When clutch pressure 148 is enough to make piston 160 and clutch pack 168 produce within the sufficiently long time period and contacts, clutch pack 168 is joined so and moment of torsion is transmitted between the corresponding input and output axle be associated, such as, transmit between input shaft 22 and output shaft 24.When clutch pack 168 is engaged so that when correspondingly transmitting (carrying) moment of torsion between input shaft 22 and output shaft 24, clutch 104 can considered to be in moment of torsion bearer cap or be in capacity/reach full capacity (at capacity) more simply.

Drive shaft speed sensor 180 is measured the rotational speed of transmission input shaft 22 and is produced the signal 184 indicating this speed.Output shaft speed sensor 188 is measured the rotational speed of transmission output shaft 24 and is produced the signal 192 indicating this speed.TCM 70 receives the signal from input and output shaft speed sensor 184 and 188.TCM 70 can also receive the signal from one or more other sensor (not shown).

TCM 70 can comprise knows control module (learning control module) 198.During stable state driving situation, know that control module 198 can optionally start and know event (learn event) for clutch 104.Stable state driving situation may reside in, such as when with relative constancy speed drive and when there is not gear shift.When clutch 104 is separated, TCM 70 can optionally start knows event for clutch 104.

Know that control module 198 can start and know event to know that clutch pressure 148 overcomes the minimum value of Returnning spring 164 for clutch 104.Minimum clutch pressure can be called as return spring pressure.Alternatively, or in addition, know that control module 198 can start and know event to know that clutch 104 will be input to clutch 104(from sky when being initially located in full capacity for clutch 104) the minimum volume of transmission oil.Minimum volume can be called as the packed space of clutch 104.Know that control module 198 can store the return spring pressure and packed space be associated with each clutch of speed changer 14 in memory.Between speed changer 14 on-stream period, such as, during gear shift, TCM 70 can use the return spring pressure and/or packed space that are stored.

With reference now to Fig. 3, present the functional block diagram of exemplary clutch capacity detection system 200.Know that control module 198 can comprise desired pressure module 204, valve actuation module 212, parameter know module 220, memory module 232, remaining time timer 236, status control module 244 and filter module 252.Know that control module 198 can also comprise acceleration module 264, buffer 272, noise detection module 278, minimum value detecting module 280, maximum value detecting module 284, difference block 292, time difference module 294 and capacity detecting module 298.

Desired pressure module 204 produces desired pressure 208.Desired pressure 208 corresponds to the order pressure 140 of aspiration level.Valve actuation module 212 produces order pressure signal 216 based on desired pressure 208.The actuating that valve actuation module 212 uses described order pressure signal 216 to control solenoid valve 128.Solenoid valve 128 activates based on described order pressure signal 216.Only exemplarily, pulsewidth modulation (PWM) can be used to carry out Controlling solenoid valve 128, and valve actuation module 212 can determine PWM dutycycle based on desired pressure 208.

Parameter knows that module 220 optionally triggers the execution knowing event to clutch 104.During approximation steady state driving situation when clutch 104 is separated, parameter is known that module 220 can trigger and is known event for clutch 104.Approximation steady state driving situation may reside in, such as, when car speed approximately constant (being greater than a zero) predetermined amount of time and when there is not shift event.

Parameter knows that module 220 can produce trigger signal 224 to start the execution to knowing event.Parameter knows that module 220 can produce trigger signal 224 to indicate the parameter of the clutch 104 that will be learned.The parameter be learned can comprise packed space or the return spring pressure of clutch 104.Parameter knows that module 220 can produce trigger signal to indicate packed space or return spring pressure.Desired pressure module 204 is for knowing that event produces desired pressure 208 in a predefined manner.

The packed space that Fig. 4 comprises for clutch 104 knows event, as the graphical representation of exemplary 302 of the desired pressure 208 of time 306 function.Also with reference to figure 3, desired pressure module 204 can produce one or more pulse in desired pressure 208 during knowing event.Show exemplary pulse, but the endurance of pulse in various embodiments can be different from the situation shown in Fig. 3.Only exemplarily, for knowing that the endurance of the pulse that event produces can increase progressively until clutch 104 reaches full capacity.

Parameter knows that the filling time section between module 220 can start (pulse in such as desired pressure 208 starts) and clutch 104 end-of-fill (end-of-pulsing in such as desired pressure 208) based on the filling of clutch 104 determines (knowing) packed space.Parameter knows that module 220 can determine packed space based on the difference between the amplitude of the pulse in the temperature of transmission oil and desired pressure 208 and return spring pressure further.Only exemplarily, fill rate (Q) can by the function determined as the temperature of transmission oil and the difference between the amplitude of pulse and return spring pressure, and packed space can by the product determined as fill rate and filling time section.

The return spring pressure that Fig. 5 comprises for clutch 104 knows the exemplary plot 340 of event as the desired pressure 208 of the function of time 344.Also with reference to figure 3, know event for return spring pressure, desired pressure module 204 can produce the first pulse 348 in desired pressure 208, afterwards desired pressure 208 is reduced to predetermined plateau pressure 352.In various embodiments, desired pressure module 204 can omit the generation of the first pulse 348, but desired pressure 208 is remained on described predetermined plateau pressure 352.The second pulse 356(can be produced relative to plateau pressure in desired pressure 208) after desired pressure module 204.The amplitude of the second pulse 356 is greater than predetermined plateau pressure 352.In various embodiments and in all cases, the amplitude of the second pulse 356 can be less than the amplitude of the first pulse 348.

When clutch 104 reaches full capacity, parameter knows that module 220 can judge that return spring pressure equals predetermined plateau pressure 352.If clutch 104 is not in full capacity within a predetermined period of time, then desired pressure module 204 can emptying clutch 104 and again start to produce the first pulse (optional), remain on predetermined plateau pressure and produce the process of the second pulse.But, replace using predetermined plateau pressure 352, desired pressure module 204 can use the second predetermined plateau pressure 360, this second predetermined plateau pressure 360 prearranging quatity larger than predetermined plateau pressure 352.The amplitude of the second pulse 356 can also be increased described prearranging quatity by desired pressure module 204.Desired pressure module 204 can repeat the process that this increases progressively the amplitude of plateau pressure used and the second pulse, until clutch 104 reaches full capacity, now return spring pressure is known.

Referring back to Fig. 3, parameter knows that the packed space known for clutch 104 and return spring pressure are stored in memory module 232 by module 220.Memory module 232 can comprise the mapping of packed space by clutch index and return spring pressure.Desired pressure module 204 can use the return spring pressure of the packed space of storage and/or storage to control the clutch be associated, such as, relate to the gear shift engaging the clutch be associated.

During knowing event, desired pressure module 204 can optionally initialization and start timer 236 remaining time.When starting to produce pulse in desired pressure 208 in each desired pressure module 204 for clutch 104, desired pressure module 204 can initialization timer remaining time 236.The every subpulse expection produced in desired pressure 208 during knowing event can cause clutch 104 to reach full capacity.Desired pressure module 204 can initialization timer remaining time 236 to pulse duration (i.e. time period) and make remaining time timer 236 start to successively decrease towards zero.In this way, remaining time, timer 236 followed the tracks of the remaining time period 240 until pulse will terminate.

Fig. 6 shows the exemplary pulse produced in desired pressure 208 as the function of time.In the example of fig. 6, desired pressure module 204 is similar to and starts to produce pulse and impulse approximation terminated in the time 608 in the time 604.Fig. 6 also show the example of the time period 240 that remaining time, timer 236 was followed the tracks of.Being similar to this time period 240 the time 604 time is initialized to the pulse duration, and the time period 240 is similar to arrives null value the time 608 time.

As mentioned above, know that event is included in desired pressure 208 and produce one or more pulse.Each pulse associating in one or more pulse described counting event.Status control module 244 controls the execution to one or more counting event described.Counting event comprises and determines whether to indicate the situation that clutch 104 arrives full capacity because of the generation of pulse in desired pressure 208.In various embodiments, each counting event can be believed to comprise four consecutive states: first (filtering) state, second (minimum value) state, the 3rd (min/max) state and the 4th (maximum value) state.

First state of counting event comprises beginning filtering.When the first state starts, (such as when the time period 240 is not equal to zero) status control module 244 triggers 248 filter modules 252 and starts filtering.Once be triggered, then filter module 252 pairs of acceleration 256 filtering thus produce filtered acceleration 260.Fig. 6 shows the illustrative trace of filtered acceleration 260.Filter module 252 can be similar to the time 604 place start to carry out filtering.

Acceleration module 264 determines acceleration 256 based on the measuring speed 268 of the axle of speed changer 14.Measuring speed 268 can be input shaft speed 184, output shaft speed 192 or other suitable speed.Acceleration module 264 can by determining that the derivative of measuring speed 268 determines acceleration 256.Only exemplarily, the filtering that filter module 252 carries out can be first-order lag filtering.

Acceleration module 264 also stores acceleration 256 in buffer 272, and this buffer has the value of the previous acceleration 256 of predetermined quantity.Only exemplarily, predetermined quantity can be eight or other suitable quantities.Buffer 272 comprises the value of the nearest acceleration 256 of predetermined quantity.Only exemplarily, buffer 272 can comprise circular buffer.

When the time period 240 is less than the first predetermined amount of time, status control module 244 can be transitioned into the second state of counting event.First predetermined amount of time is greater than zero and is less than the pulse duration.In this way, status control module 244 before end-of-pulsing (and reaching before zero in the time period 240) starts the second state.In the example of fig. 6, such as, status control module 244 can be similar to and be transitioned into the second state the time 612 time.

Second state of counting event comprises and judges whether acceleration 256 is noisy and the minimum value 274 determining filtered acceleration 260.When the time period 240 is less than the first predetermined amount of time status control module 244 via the second state signal 276 to enable noise detection module 278 and minimum value detecting module 280.When the time period 240 is less than the first predetermined amount of time, window timer (not shown) can also be reset to predetermined reset value (such as 0), make window timer start to increase progressively and window limit setting is become the second predetermined amount of time of the second state by status control module 244.In the example of fig. 6, the second predetermined amount of time was limited by time 612 and time 616.

Noise detection module 278 judges whether there is noise in acceleration 256 when activated.Noise detection module 278 can judge whether there is noise in acceleration 256 based on the difference between the predetermined value in the value of the previous acceleration 256 stored in acceleration 256 and buffer 272.Only exemplarily, when described difference is greater than predetermined difference, noise detection module 278 can judge to there is noise in acceleration 256.Additionally or alternately, when during the second state, the change of acceleration 256 exceeds prearranging quatity, noise detection module 278 can judge to there is noise in acceleration 256.Noise detection module 278 produces noise signal 282, whether in acceleration 256, detects noise during this noise signal 282 indicates capacity detection event.

Minimum value detecting module 280 determines the minimum value 274 of filtered acceleration 260 when activated.The value whether value whether minimum value detecting module 280 can be less than minimum value 274 and previous filtered acceleration 260 based on filtered acceleration 260 is greater than current filtered acceleration 260 determines minimum value 274.If the two is all very, then minimum value 274 can be set to and equal filtered acceleration 260 by minimum value detecting module 280.If one or both is false, then minimum value detecting module 280 can maintain minimum value 274.The time stamp that minimum value detecting module 280 corresponds to minimum value 274 sets the minimum value time 283.In the example of fig. 6, minimum value 274 is shown by 620.In the example of fig. 6, the minimum value time 283 corresponding to minimum value 274 results from time proximity 624 place.

When during the second state, window timer is more than or equal to window restriction, status control module 244 can forbid noise detection module 278 via the second state signal 276 and via third state signal 286 to enable minimum value detecting module 280 and maximum value detecting module 284.When window timer is more than or equal to window restriction, window timer can also be reset to predetermined reset value, make window timer start to increase progressively and window limit setting is become the 3rd predetermined amount of time for the third state of counting event by status control module 244.In the example of fig. 6, the 3rd predetermined amount of time was limited by time 616 and time 628.Although minimum value 274 is illustrated as and occurs in the 3rd predetermined amount of time in the example of fig. 6, but minimum value 274 can also occur in the second predetermined amount of time.

Minimum value detecting module 280 can continue to determine minimum value 274 as mentioned above.Maximum value detecting module 284 determines the maximum value 287 of filtered acceleration 260 when activated.The value whether value whether maximum value detecting module 284 can be greater than maximum value 287 and previous filtered acceleration 260 based on filtered acceleration 260 is less than current filtered acceleration 260 determines maximum value 287.If the two is all very, then maximum value 287 can be set to and equal filtered acceleration 260 by maximum value detecting module 284.If one or both is false, then maximum value detecting module 284 can maintain maximum value 287.The time stamp that maximum value detecting module 284 corresponds to maximum value 287 sets the maximum value time 288.In the example of fig. 6, maximum value 287 is shown by 632.In the example of fig. 6, the maximum value time 288 corresponding to maximum value 287 results from time proximity 636 place.

When during the third state, window timer is more than or equal to window restriction, status control module 244 can forbid minimum value detecting module 280 via third state signal 286 and via the 4th state signal 290 to enable maximum value detecting module 284.When window timer is more than or equal to window restriction, window timer can also be reset to predetermined reset value, make window timer start to increase progressively and window limit setting is become the 4th predetermined amount of time for the 4th state of counting event by status control module 244.In the example of fig. 6, the 4th predetermined amount of time was limited by time 628 and time 640.Maximum value detecting module 284 can continue to determine maximum value 287 as mentioned above.Although maximum value 287 is illustrated as and occurs in the 4th predetermined amount of time in the example of fig. 6, but maximum value 287 can also occur in the 3rd predetermined amount of time.

When during the 4th state, window timer is more than or equal to window restriction, status control module 244 can forbid maximum value detecting module 284 via the 4th state signal 290.Based on minimum value 274 and maximum value 287, difference block 292 determines that acceleration differs from 293.More specifically, difference block 292 can differ from 293 and is set to that equaling maximum value 287 deducts minimum value 274 by degree of will speed up.Illustrate that acceleration differs from 293 by 644 in the example of fig. 6.

Time difference module 294 determines the time difference 295 based on maximum value time 288 and minimum value time 283.More specifically, the time difference 295 can be set to that equaling the maximum value time 288 deducts the minimum value time 283 by difference block 292.By 648, be shown the time difference 295 in the example of fig. 6.Difference block 292 and time difference module 294 provide acceleration to differ from 293 and time difference 295 to capacity detecting module 298 respectively.

When during the 4th state, window timer is more than or equal to window restriction, status control module 244 can be forbidden maximum value detecting module 284 via the 4th state signal 290 and enable capacity detecting module 298.Capacity detecting module 298 via the 4th state signal 290 or can be activated with other appropriate ways.

Owing to whether detecting the pulse of noise, minimum value 274, maximum value 287, minimum value time 283 and/or maximum value time 288 based on during counting, capacity detecting module 298 determines whether clutch 104 reaches full capacity.Only exemplarily, when not detecting noise, acceleration is when differing from that 293 are greater than the first predetermined acceleration, the maximum value time 288 is greater than (being namely later than) minimum value time 283 and the time difference 295 is less than or equal to predetermined maximum time period, and capacity detecting module 298 can judge that clutch 104 reaches full capacity.Additionally or alternately, when acceleration differ from 293 be greater than the second predetermined acceleration time, capacity detecting module 298 can judge that clutch 104 reaches full capacity.Second predetermined acceleration is greater than the first predetermined acceleration, and the maximum value that can differ from 293 based on the acceleration being attributable to maximum possible noisiness sets the second predetermined acceleration.

Capacity detecting module 298 produces capacity signal 299, and during this capacity signal 299 indicates counting event, whether clutch 104 reaches full capacity.Only exemplarily, when during counting event, clutch 104 reaches full capacity, capacity signal 299 can be set to state of activation by capacity detecting module 298.Capacity signal 299 can be locked in state of activation one predetermined amount of time by capacity detecting module 298.

Parameter knows that module 220 receives capacity signal 299 from capacity detecting module 299.During knowing event, parameter know module 299 follow the tracks of the counting event of last predetermined quantity (such as Y) during the number of times (such as X time) of clutch 104 when reaching full capacity.Once there occurs at least predetermined quantity Y counting event during knowing event, then when X is greater than predetermined value, parameter has known that module 220 can be known the value (that is, return spring pressure or packed space) that will be learned and terminate to know event.Only exemplarily, when reaching full capacity during at least 3 counting events in clutch 104 in the end 5 counting events, parameter knows that module 220 can be known the value that will be learned and terminate to know event.If X is not more than described predetermined value, then parameter know module 220 can emptying clutch 104 and start for knowing that next counting event of event produces next pulse in desired pressure 208.One or more other modules additionally or alternately can use capacity signal 299.

With reference now to Fig. 7 A-7B, present and describe the flow chart whether judgement clutch 104 reaches the illustrative methods 700 of full capacity.Control can start from 702, and control to start to produce pulse in desired pressure 208 at this, clutch 104 reaches full capacity from now expection.Control, at 704 places, timer remaining time 236 is initialized to the pulse duration.Control also to make at 704 places remaining time timer 236 to start towards zero countdown.Control to start to carry out filtering to acceleration 256 at 706 places.

At 708 places, control judgement timer remaining time 236 and whether be less than the first predetermined amount of time.If be true, then control to proceed to 710; If be false, then control to remain on 708.First predetermined amount of time is less than the pulse duration and is greater than zero.Control reset window timer at 710 places and window limit setting is become the second predetermined amount of time for the second state.At 712 places, control the minimum value 274 determining filtered acceleration 260 and the minimum value time 283 be associated with minimum value 274.At 714 places, control to judge whether there is noise in acceleration 256.

At 716 places, control to judge whether window timer is more than or equal to window restriction.If be true, then control to proceed to 718; If be false, then control to return 712.At 718 places, control to reset window timer and window limit setting is become the 3rd predetermined amount of time for the third state.At 720 places, control to continue to determine minimum value 274 and minimum value time 283.At 722 places, control the maximum value 287 determining filtered acceleration 260 and the maximum value time 288 be associated with maximum value 287.

At 724 places, control to judge whether window timer is more than or equal to window restriction.If be true, then control to proceed to 726; If be false, then control to return 720.At 726 places, control to reset window timer and window limit setting is become the 4th predetermined amount of time for the 4th state.At 728 places, control to continue to determine maximum value 287 and maximum value time 288.At 730 places, control to judge whether window timer is more than or equal to window restriction.If be true, then control to proceed to 732; If be false, then control to return 728.

At 732 places, control to determine that acceleration differs from 293 and time difference 295.Control can differ from 293 and is set to that equaling maximum value 287 deducts minimum value 274 by degree of will speed up.Time difference 295 can be set to that equaling the maximum value time 288 deducts the minimum value time 283 by control.In this way, when the maximum value time 288 is in after the minimum value time 283, the time difference 295 be on the occasion of.Control in figure 7b to proceed to 734.

734, control to judge: whether (1) does not detect noise; (2) acceleration differs from 293 and whether is greater than the first predetermined acceleration; (3) whether maximum value time 288 is after the minimum value time 283; And whether (4) time difference 295 is less than or equal to predetermined maximum time period; Or judge that (5) acceleration differs from 293 and whether is greater than second predetermined acceleration larger than the first predetermined acceleration.If (1)-(4) are if be true or (5) are true, then control to proceed to 736.If one or more in (1)-(4) is false and (5) are false, then control to proceed to 738, this will hereafter discuss.

At 736 places, control to indicate clutch 104 during counting event and reach full capacity, and control to proceed to 740.At 738 places, control to indicate clutch 104 during counting event and do not reach full capacity, and control to proceed to 740.During controlling to judge at least M counting event in the last N number of counting event knowing event, whether clutch 104 reaches full capacity.If be true, then control to know the value that will be learned at 742 places and terminate to know event, and controlling to terminate.If be false, then controlling can emptying clutch 104, and controls to turn back to 702(Fig. 7 A) to know event by producing next pulse to continue in desired pressure 208 for next counting event.M and N be greater than 1 integer, and N is more than or equal to M.Only exemplarily, N can be 5 and M can be 3.

Extensive instruction of the present disclosure can be implemented in a variety of manners.Therefore, although the disclosure comprises concrete example, but true scope of the present disclosure should not be so limited, because technician will be apparent to other remodeling on the basis of research accompanying drawing, specification and claims.

Claims

1. a system for vehicle, comprising:

Filter module, its to the acceleration filtering of the axle of described automatic transmission thus produce filtered acceleration;

Capacity detecting module, it indicates described clutch based on described filtered acceleration and whether reaches moment of torsion bearer cap;

2. system according to claim 1, wherein when car speed be greater than zero, described clutch there is no bearing torque and a second clutch bearing torque time, described desired pressure module produces described increase.

3. system according to claim 1, wherein said capacity detecting module indicates described clutch based on very first time when there is described minimum value with the second time when there is described maximum value further and whether reaches moment of torsion bearer cap.

4. system according to claim 3, also comprises noise detection module, and whether its noise indicated in described acceleration based on the difference between described acceleration and previous accekeration is greater than predetermined noise,

5. system according to claim 4, wherein when described noise be less than described predetermined noise, between described maximum value and minimum value difference is greater than the first predetermined acceleration, described second time, the time period after the described very first time and between described first and second times was less than predetermined maximum time period time, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

6. system according to claim 5, when the difference wherein between described maximum value and minimum value is greater than second predetermined acceleration larger than described first predetermined acceleration, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

7. system according to claim 1, also comprises noise detection module, and whether its noise indicated in described acceleration based on the difference between described acceleration and previous accekeration is greater than predetermined noise,

Wherein when described noise is greater than described predetermined noise and difference between described maximum value and minimum value is greater than predetermined acceleration, described capacity detecting module indicates described clutch and reaches moment of torsion bearer cap.

8. system according to claim 1, also comprises parameter and knows module, and its response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine the volume causing described clutch to reach the described hydraulic fluid of moment of torsion bearer cap.

9. system according to claim 1, also comprises parameter and knows module, and its response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine that described hydraulic fluid overcomes the pressure of the Returnning spring of described clutch.

10. a method, comprising:

Solenoid valve is activated based on described desired pressure,

Filtered acceleration produces to the acceleration filtering of the axle of described automatic transmission;

Indicate described clutch based on described filtered acceleration and whether reach moment of torsion bearer cap;

11. methods according to claim 10, also comprise: when car speed be greater than zero, described clutch there is no bearing torque and a second clutch bearing torque time, produce described increase.

12. methods according to claim 10, also comprise: indicate described clutch based on very first time when there is described minimum value with the second time when there is described maximum value further and whether reach moment of torsion bearer cap.

13. methods according to claim 12, also comprise:

14. methods according to claim 13, also comprise when described noise be less than described predetermined noise, between described maximum value and minimum value difference is greater than the first predetermined acceleration, described second time, the time period after the described very first time and between described first and second times was less than predetermined maximum time period time, indicate described clutch and reach moment of torsion bearer cap.

15. methods according to claim 14, also comprise: when the difference between described maximum value and minimum value is greater than second predetermined acceleration larger than described first predetermined acceleration, indicates described clutch and reach moment of torsion bearer cap.

16. methods according to claim 10, also comprise:

When described noise is greater than described predetermined noise and difference between described maximum value and minimum value is greater than predetermined acceleration, indicates described clutch and reach moment of torsion bearer cap.

17. methods according to claim 10, also comprise: response indicates described clutch and reaches moment of torsion bearer cap to determine the volume causing described clutch to reach the described hydraulic fluid of moment of torsion bearer cap.

18. methods according to claim 10, also comprise: response capacity detecting module indicates described clutch and reaches moment of torsion bearer cap to determine that described hydraulic fluid overcomes the pressure of the Returnning spring of described clutch.